The gas that can best be collected by downward displacement of air is
- Chlorine
- Sulphur (IV) oxide
-
Ammonia
- Carbon (IV) oxide
The correct answer is: C
Explanation
The method used to collect a gas depends on whether it is denser or lighter than air. For example, ammonia gas is collected by downward displacement of air because it is lighter than air. Option C is the correct answer.
Chlorine is heavier than air.
SO\(_2\) is denser than air.
CO\(_2\) is denser than air.
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